Direction: Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need.

    Red grouper(石斑鱼) are known for a few key characteristics — their color, which can {#blank#}1{#/blank#}from pink to bright orange; their tastiness, whether they're grilled or fried; and their predation (掠夺行为) method, in which they {#blank#}2{#/blank#} sea creatures and swallow them whole.

    But their least-known characteristic might be the most valuable of all: They operate as underwater architects, {#blank#}3{#/blank#} the seascape for numerous other forms of underwater life. That surprising discovery is {#blank#}4{#/blank#} scientists and policymakers to readjust their approach to preserving the ocean's natural order — and heightening tensions with those who fish for a living or as a hobby.

    A team of scientists, led by Florida State University's Felicia Coleman, recently found that the red grouper off Florida's east and west coasts have created entire ocean {#blank#}5{#/blank#}by digging large holes in the sea's sandy bottom. In the same way beavers {#blank#}6{#/blank#}dams, red grouper dig and maintain distinct holes whose rocky surfaces provide a place for coral, sponges and other marine life to gather.

    This new understanding is changing the way federal and state authorities manage ocean habitats and is creating a completely new crack with fishermen. “The people who are in control want to {#blank#}7{#/blank#} fishing as much as possible,” said Bob Jones, executive director of the Southeastern Fisheries Association. He added that the recent discoveries about red grouper amount to an “excuse they can use to restrict fishing, {#blank#}8{#/blank#}or recreational.”

    But to many researchers, fishery officials and even some fishermen, the fact that fish act as environmental engineers provides a compelling reason to protect them from exploitation.

    “If you {#blank#}9{#/blank#} that fish, it puts into motion a whole chain of events,” said Don deMaria, who used to fish for red grouper near Key Largo, Fla., but no longer does. “There's a whole lot of other animals that are {#blank#}10{#/blank#}. I'm not saying you can't catch them. But you can't do it to the extent we've been doing for the last 20 years.”

    For several decades, various types of artificial intelligence kept shocking the world. Robots could {#blank#}1{#/blank#} people in highly competitive games and then quickly destroyed their human competitors.

    AI long ago mastered chess, the Chinese board game Go and even the Rubik's cube, which it managed to solve in just 0. 38 second.

    Now machines have a new game that will allow them to {#blank#}2{#/blank#} humans: Jenga, the popular game in which players {#blank#}3{#/blank#} remove pieces from an increasingly unstable tower of 54 blocks, placing each one on top until the entire structure would {#blank#}4{#/blank#}.

    A newly released video from MIT shows a robot developed by the school's engineers playing the game with surprising accuracy. The machine is equipped with a soft gripper (夹子), a force-sensing wrist and an external camera, allowing the robot to detect the tower's {#blank#}5{#/blank#} the way a human might do

    Unlike in purely recognitive tasks or games such as chess or Go, playing the game of Jenga also requires mastery of physical acts such as pushing, pulling, placing, and arranging pieces. It must {#blank#}6{#/blank#} interactive physical operation, where you have to touch the tower to learn how and when to move blocks.

    Imitating it is rather difficult, so the robot has to learn in the real world, by working with the real Jenga tower. Recently, a relevant research was published in the journal Science Robotics. Researchers say the robot demonstrates that machines can learn how to perform certain tasks through actual touching instead of relying heavily on visual {#blank#}7{#/blank#}. That physical {#blank#}8{#/blank#} is significant, researchers say, because it provides further proof that robots can be used to perform {#blank#}9{#/blank#} tasks, such as separating recyclable objects from landfill trash and assembling consumer products.

    In a cellphone assembly line, the felling of any component is coming from force and touch rather than vision. To become an accomplished Jenga player, the robot did not require as much repetitive practice as you might imagine. Hoping to avoid reconstructing a Jenga tower thousands of times, researchers developed a method that allowed the robot to be trained on about 300 games. Researchers say the robot has already begun facing off against humans, who remain {#blank#}10{#/blank#} players—for now.

What Is a Paragraph Break?

It is one of the most important punctuation marks. A paragraph break is an indentation (缩造) or a single line space{#blank#}1{#/blank#}the division between one paragraph and the next in a body of text.

Generally, paragraph breaks serve to{#blank#}2{#/blank#}the transition from one idea to another in a stretch of text, and from one speaker to another in an exchange of dialogue.

Few readers would think of the paragraph break as a punctuation mark, but it certainly is. In ancient times there were no paragraphs. Sentences simply flowed into one another without{#blank#}3{#/blank#}.During medieval (中世纪) times, the mark evolved into the paragraph symbol and eventually became the modern-day paragraph break, which is{#blank#}4{#/blank#}now only by a line break or indentation.

Today, the paragraph break is used to give readers a break. The art of creating paragraphs is called paragraphing, the{#blank#}5{#/blank#}of dividing a text into paragraphs. Paragraphing is a kindness to your reader because it divides your thinking into manageable bites. Paragraphs that are too long{#blank#}6{#/blank#}readers with dense blocks of text to read through, while more frequent paragraphing provides readers with convenient{#blank#}7{#/blank#}points at which to take a break and relaunch themselves into thinking.

To fully understand when to insert a paragraph break, it's helpful to know that a paragraph is a group of closely related sentences that develop a central idea. Therefore, each paragraph discusses one{#blank#}8{#/blank#}topic. Also, a paragraph break is cmploycd before each new topic is introduced. In this way, the writing will flow, and readers will be able to proceed through the writing in a logical fashion instead of{#blank#}9{#/blank#}all the way to get to the last line.

Paragraphs used to be longer, but with the development of the Internet, which gives readers access to literally millions of sources of information, paragraphs have become increasingly{#blank#}10{#/blank#}. The style for many websites, for example, uses paragraphs no more than two to three sentences.